Is possible some way to migrate SSL Cert. with CSR from another server (not ispconfig)?

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Yes, make backups of the SSL files generated by ISPConfig in the ssl folder, and then place your cert, csr and key in the ssl folder and rename them to the files names of the original SSL files generated by ISPConfig. Restart Apache afterwards.

What happend if some customer activate SSL from his website on same server (same public IP)?

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You can enable SNI under Sstem > Server Config on the Web tab. If you use SNI, you can run multiple SSL web sites on one IP (but be aware that not all browsers support this, for example, IE on WinXP has no SNI support; all other browsers are fine).

You must enable SSL for both domains (and both domains must have an SSL cert).

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I tried like you described - for both domains is SSL enabled and both have SSL Cert.

Problem is second domain which using SSL cert from first domain - isnt working like you described. Is possible check if is SNI working?
Is necessary select for domains IP address from roll menu or I can use option "*" (I´m using option "*" for all of my websites). I mean for SNI and SSL working right.